| Die Fledermaus | |
|---|---|
| Operetta by Johann Strauss II | |
 | |
| Librettist | |
| Language | German |
| Based on | Gefängnis by Julius Roderich Benedix |
| Premiere | 5 April 1874 Theater an der Wien, Vienna |
Die Fledermaus (German: [diː ˈfleːdɐˌmaʊs], The Flittermouse or The Bat, sometimes called The Revenge of the Bat) is an operetta composed by Johann Strauss II to a German libretto by Karl Haffner and Richard Genée, which premiered in 1874.